In the study of language acquisition, one of the central problems is how to bridge a qualitative gap between the primary linguistic data (PLD) that children are exposed to and the final state of a particular grammar that children acquire. Universal Grammar (UG) is assumed to play a crucial role in this problem. The aims of this report are: (1) to specify which subsystems of UG are involved in the course of acquiring derived nouns or what is given innately for the acquisition of derived nouns, if specified, (2) to make explicit what kind of information children have to receive from the PLD in order to get the same knowledge that adults have for derived nouns, and (3) to propose a learning model that is compatible with conditions (1) and (2). It is shown that derived nouns are productively acquired in accordance with the learning model proposed, and that uniformity condition, which is assumed to be included in UG, regulates the occurrence of overgeneralization. (VWL)